1 # SPDX-License-Identifier: GPL-2.0
4 select ARCH_HAS_SYNC_DMA_FOR_CPU
5 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
9 select GENERIC_ATOMIC64
10 select GENERIC_CLOCKEVENTS
11 select GENERIC_CPU_DEVICES
12 select GENERIC_IRQ_PROBE
13 select GENERIC_IRQ_SHOW
14 select GENERIC_STRNCPY_FROM_USER
15 select GENERIC_STRNLEN_USER
16 select HAVE_ARCH_TRACEHOOK
19 select MODULES_USE_ELF_RELA
21 select OF_EARLY_FLATTREE
24 select USB_ARCH_HAS_HCD if USB_SUPPORT
25 select CPU_NO_EFFICIENT_FFS
26 select ARCH_DISCARD_MEMBLOCK
31 config GENERIC_HWEIGHT
34 config GENERIC_CALIBRATE_DELAY
46 config RWSEM_GENERIC_SPINLOCK
49 config TRACE_IRQFLAGS_SUPPORT
52 menu "Kernel features"
54 source "kernel/Kconfig.hz"
56 config FORCE_MAX_ZONEORDER
57 int "Maximum zone order"
61 The kernel memory allocator divides physically contiguous memory
62 blocks into "zones", where each zone is a power of two number of
63 pages. This option selects the largest power of two that the kernel
64 keeps in the memory allocator. If you need to allocate very large
65 blocks of physically contiguous memory, then you may need to
68 This config option is actually maximum order plus one. For example,
69 a value of 11 means that the largest free memory block is 2^10 pages.
73 source "arch/nios2/platform/Kconfig.platform"
75 menu "Processor type and features"
84 config NIOS2_ALIGNMENT_TRAP
85 bool "Catch alignment trap"
88 Nios II CPUs cannot fetch/store data which is not bus aligned,
89 i.e., a 2 or 4 byte fetch must start at an address divisible by
90 2 or 4. Any non-aligned load/store instructions will be trapped and
91 emulated in software if you say Y here, which has a performance
94 comment "Boot options"
97 bool "Default bootloader kernel arguments"
101 string "Default kernel command string"
103 depends on CMDLINE_BOOL
105 On some platforms, there is currently no way for the boot loader to
106 pass arguments to the kernel. For these platforms, you can supply
107 some command-line options at build time by entering them here. In
108 other cases you can specify kernel args so that you don't have
109 to set them up in board prom initialization routines.
112 bool "Force default kernel command string"
113 depends on CMDLINE_BOOL
115 Set this to have arguments from the default kernel command string
116 override those passed by the boot loader.
118 config NIOS2_CMDLINE_IGNORE_DTB
119 bool "Ignore kernel command string from DTB"
120 depends on CMDLINE_BOOL
121 depends on !CMDLINE_FORCE
124 Set this to ignore the bootargs property from the devicetree's
125 chosen node and fall back to CMDLINE if nothing is passed.
127 config NIOS2_PASS_CMDLINE
128 bool "Passed kernel command line from u-boot"
131 Use bootargs env variable from u-boot for kernel command line.
132 will override "Default kernel command string".
133 Say N if you are unsure.
135 config NIOS2_BOOT_LINK_OFFSET
136 hex "Link address offset for booting"
139 This option allows you to set the link address offset of the zImage.
140 This can be useful if you are on a board which has a small amount of
145 menu "Advanced setup"
147 config ADVANCED_OPTIONS
148 bool "Prompt for advanced kernel configuration options"
150 comment "Default settings for advanced configuration options are used"
151 depends on !ADVANCED_OPTIONS
153 config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
154 bool "Set custom kernel MMU region base address"
155 depends on ADVANCED_OPTIONS
157 This option allows you to set the virtual address of the kernel MMU region.
159 Say N here unless you know what you are doing.
161 config NIOS2_KERNEL_MMU_REGION_BASE
162 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
165 This option allows you to set the virtual base address of the kernel MMU region.
167 config NIOS2_KERNEL_REGION_BASE_BOOL
168 bool "Set custom kernel region base address"
169 depends on ADVANCED_OPTIONS
171 This option allows you to set the virtual address of the kernel region.
173 Say N here unless you know what you are doing.
175 config NIOS2_KERNEL_REGION_BASE
176 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
179 config NIOS2_IO_REGION_BASE_BOOL
180 bool "Set custom I/O region base address"
181 depends on ADVANCED_OPTIONS
183 This option allows you to set the virtual address of the I/O region.
185 Say N here unless you know what you are doing.
187 config NIOS2_IO_REGION_BASE
188 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL